Direct effects of acidic wet deposition on photosynthesis and stomatal conductance of two Populus clones (P. cv. Beaupré and P. cv. Robusta) C. Martens, K. Landuydt and I. ImpensAnn. For. Sci., 46 Supplement (1989) 586s-589sDOI: https://doi.org/10.1051/forest:198905ART0133